Machine for making printers&#39; rules and leads



MACHINE FOR MAKING PRINTERS RULES AND LEADS FlledMarch 18, 1925 2 Sheets-Sheet 1 May 22, 1928. 1,671,688

G. H. M. DAHL MACHINE FOR MAKING PRINTERS RULES AND LEADS Patented May '22, 1928.

'GEORGE'H. ivr-nm L, or wAsHINeroN, DISTRICT or COLUMBIA.

MACHINE FOR MAKING PRINTERS nULns AND LEADS. I

Application filed March 18,1925. semino. 16,513.

My said invention relates to a machine for making printers leads and rules aud t is an object thereotto provide a dev ce of th1s character which shall form leads better and.

more satisfactory in use than those heretofore known." Various machines have been devised for this purpose but they are ordinarily defective in that air gets into the compartment through which lead is forced intothe mold and is trapped in the mold which gives rise to weak places in the. leads and rules and it is found that they break at these weak places.

Y A .further objector the invention is to provide a machine in which, by

means of aslight change of parts leads. and rulesQof various thickness can'be molded, the character of the attachment being such that a change in, thickness can be'made veryquickly and .by unskilled workmen.

' Stillanother object jis to provide a continuous flow mold for leads and rules.

:teierring to the accompanying drawings which are made'a part hereof and on which similar reference characters indicate similar parts, v Figure 1 to Figure 1,

Figure 3, a

device v Figure 4, a side elevation of devices on an enlarged scale,

isa side elevation of my device, Figure 2,.a vertical sectionat'right angles.

detail of pistons used in the.

the molding Figure 5, an elevation at right angles to Fig.v 4,

Figure 6, a section on line 6-6 oi Fig. 4-,

Figure 7 a plan of themold, Figure 8, a 7 side elevation shown in various other figures,

ot a block and F igure 9, a detail ofa closure for the vent at the bottom ofrtlie pot.

In the drawings reference character 10 in-' dicates a melting pot for type metal or other metal used in the printers trade, th s pot being of ordinary form and b eing used to melt metal forvariouspurposes. A jacket 11 surrounds the pot whichxis supported by means of legs in conventional manner and a otthje space vent 12 is providedat the top between the pot andthe jacket to permit escape. of exhaust gases from'the flame by which the potis heated.

Gas for this flameis provided by a pipe 13 arranged in annular form underneath the pot. m. Within the pot an angular fr 11116, here inlateral flange 18 resting on the upright flange 14. The rim 19 of said member fits into the'frame at the inner side of the flange 1% and. rests on the llOYlZOIlllll flange 1. 1

thusformin'g'a liquid-tight closure.

Ihree cylinders 20 are set into the hotter. (which in the inverted position forms the upber'hart) of the member 17 and "are sc--' cured in position in any suitable manner.- These cylinders may, of course, be made integral with the member 17 if desired. Pistons 21 are-;movable up and down in the cylinders 20. These pistons are operated by means of cams'22 on cam shaft 23 acting,againstiollowers 24 on thedepending arms 25 ot bent levers having laterally ex;

tending arms 26 pivotally attached to .con. 7 I

necting rods which are pivoted in turn torods 28 extending through caps 29 closing upwardly-opening recesses in the pis:

tons. The followers 24; may be held against cams 22 by springs 24. or otherwise.

The rods 28 are provided with heads 30 and coil springs 31 are positioned about the rods between said heads and the caps 29, these caps being rigidly secured to the pistons in any suitable manner. The yieldable connection permits positive limitation of the upward movement of. thopistons and such limitation is provided byfixed abutments 32 on the cylinders coacting with abutments 32-5 on the pistons to. arrest positively the upward movement of the pistons. One purpose of such limitation to insure that the melted metal in the pot will be permitted to flow into the chamber 16 atthe end of the upward stroke of each piston. For this purpose the pistons are provided atltheir lower ends with recessesfit having radial passages 35 communicating therewith and extending to the outer wall of the piston or to one ofthe ring grooves 36 formed in the the chamber .16 through the passage and recess 34 whenthepiston is attire upper end of its movement.

It should be noted at this point that the abutments are formed... atspacedintervals. 4

about the stem of the piston-for the reason that a continuous bearing a surface, between the piston and the cylinder is impracticable as the metal will become)setbetvzeen such;

continuous adjacent surfaces and so will clogthe pistonandstop its movement-.

At the'lower cn d o i' each cylinder a float valve 38 is. provided by means of which the molthmmetal is permitted to move in one direction only. This iioat valve may be oi cast ron so as to float on the melted metal in the chamber and as seen in Fig. 3it

ing means for the pistons are illustrated as being three in number and it is intended in all cases that there shall bemorethan one thoughthe number may be varied if desired.

One purpose in providing three pistons is that this enables the machine to keep up a constant flow oiimetalinto the chamber 16 and hence to the mold which is one means -l'or preventing access of air to the chamber and therefore to the mold, In machines of the prior art a single piston has been em ployed/and hence there could not a continuous flowfoi molten metal. Theme talpasses" from the chamber to the] mold through a smalllhreaded port .42" in th'e'bottom of? the pot this portbeing preferably directly in line with the middle cylinder. By such construction the portcan be closech as when it is ncccssary to ha've-access tothe mold for repairs or for other purposegby,

merelyremoving; the central piston and insertinga roddB downthrough thecyhnder the rod having a threaded end 44 to be screwed into the threaded port 42 andefi'cctually shut ofltheflow of metal.

The screws 5 in addition to holding down the angular frame 14L also serve for at-tachihcnt tofthe bottom of the] pot of a block do fo rmingthe upper membeir of' the mold;

This 'blockisprovidedat "4G with an aper us registering with the port which aperture may be p, of smaller S128 and sh ape j ilared out at the lower end or or may be A pair of otherwise be. of different shape.

blocks 47 ahddS are secured to-the block reasons, so that aflmoldioi-rnak- 1 by means of screws 49, these blocks forming thesides oi -the m ol dr A block; 50 is held; between the blocks i? and 48' in fixed relation-thereto by means of screws 51, this t-its upper endagainst block secured thereto if preferred.

A; block, 1s: adjustably. mounted 1 between the blocks a7 and48 and provides with the other membersolrrthe mold a mold chamber 53 of uniform length and Widthand variahle in thicknessby movement oiikthe blockfiQt i i For purposes 01 adjustment "the blOcksiMlZa and QSfar'e provided with rowsiol holes. at 54', each oi? said holesbei-ngw.adapted-to regsister v ith one of the holes in a row. atm55f.

on thebloclc 52 The ro'ws 55, as willlbe scenin Fig. g are arranged dragonally and therelore movement oi the block o oiw'ard l l T i u. i 5 and 'lrom the blOCliDQWlll posit on uccese sivel holes in "registry w ith each; other: whichpinsoil can be thrust tliriouglntlies registering holes to i'naintain the adjust inentl' Thereafter the bloc /5Q is securely lockedin'place by means of sciews ho The block 45 is made detachable, among 'ot iruleslci quickly be substituted tor amold itor lorminlg leads and vice VBZfSElt it'bei-nELonly; ne essary to stop the outlet ofthechamb'er by meansoi? he more a few screws to take on the mold that is in use. i H

flit is essential that the mold be cooled-Ito cause thounetal to set quickly aud tor-this purpose each oi the blocks 50 and 52; is provided with a series oi vertical; passes! s 57 coiinnunicating; at the 1ower end w transverse passage 58 supplied withL-waterl or' other "cooling fluidby a pipe 59.- Atgthe upper end there is a similar transverselpassage "6O icommunicating with an outletlplpe aiiter 61. These transverse passages.areclosed at the endsbyineans of plugs in well k nown manner as are also the vertical passagesat their lower ends except ons which comm t nicates with the pipefil;

' It will he obviousto those.skilledginvthe art that various changes may be m'adejin;

my device without departing irom-thesp r-it of the invention andthat flui-d metal may be shapedthereby for;other purposes and therefore I i do not" limit myself to what is shownin the drawings anddescrihedJinthe;

specification butonly as indicatechin' the appended claims. 1 i Having. thus ffully described my-saidnin-i vention, whatI claim asneW-and desire to secure byLetters Patent, is: i

1. A machine'lor making printers leads:

and rules, comprising a melting pot,a closed chamber therein, a mold underneath the chamber, a straight passage extend-mm throughthe bottomofithe 1neltinfg.. :)'ot.anc J i the mold, and a plurality (ii pistons. operating in timed relation to force molten metalmovernentof said metal, substantially as set through the chamber in a continuous flow, substantially as set forth.

2. A machine for making printers leads and rules comprising a melting pot, a closed chamber therein, a mold attached to the'bottom of the pot, a passage through said bottom leading to the mold said pas-sage communicating with the chamber, a plurality of cylinders communicating with the pot and the chamber, pistons in the cylinders, rods connected to the pistons, means for moving the rods positiyely upward and yieldingly' downward, positive means for hunting the upward movement, and passages leading from the pottl'irough the cylinder andpis ton to the lower end of the cylinder when the piston is fully retracted, substantially as set forth. p

3. A machine'for making printers leads and rules comprising a pot, a closed chamher, a cylinder communicating with the pot and the chamber, and a piston in the cylinder having guiding lugs for engagement with the cylinder wall, substantially as set forth. l I

at. A machine for making printers leads andrules comprising a pot, a'closed chamber, a cylinder communicating with the pot and the chamber, a piston in the cylinder having guiding lugs for engagement with the cylinder wall, yieldable means for retracting the piston, and 'abutment's on the cylinder wall adapted to'engage'said lugs for limiting such retracting moven'ient, substantially as set forth.

A machine for making printers leads and rules comprising a pot, a closed Cht111' ber, a cyhnder communlcatlng with the pot and the chamber, a piston in the'cylinder having guiding lugs for engagement with the cylinder wall, yieldable means for retracting the piston, abutments on the cylinder wall adapted to engage said lugs for limiting such retracting movement, a recess at the-lower end of the piston and registering orifices in the piston and the cylinder wall providing a passage from the pot to said recesses when the piston is in its retracted position, substantially as set forth.

6. A machine for making printers leads I and rules comprising a melting pot,'a chamber, a. cylinder leading into the chamber, means for forcing metal from the pot into the chamber. through said cylinder, and a .floating valve at the lower end of the cylinder for preventing return movement of said metal, substantially as set forth.

7. A machine for making printers leads and rules comprising a melting pot, a, chamber, a cylinder leading into the chamber,- means for forcing molten metal from the pot into the chamber through said cylinder, and a floating cast iron valve at the lower end of the cylinder for preventing return forth.

'8. A machine for making printers leads and rules comprising a melting pot, a chamber, a cylinder" leading to the chamber, means for forcing metal from the'pot into the chamber through said cylinder, a floating valve at the lowerend of the cylinder for preventing return movement of said metal, and means for guiding the valve relatively to the cylinder, substantially as set forth.

9. A 'machine for making printers leads and rules comprising a melting pot, a chamber, a cylinder leading into the chamber, means for forcing metal from the pot into the chamber through said cylinder, a float ing valve at the lower end of the cylinder for preventing return movement of said metal,

the cylinder comprising a rod extending across the chamber, and a spur on the rod extending into an opening in the valve, sub stantially as set forth. p

10. In a. machine for making printers leads and rules, amelting pot, a chamber with the cylinder, and a threadedrod constructed and arranged to be inserted through I said cylinder and to be screwed into said threaded orifice, substantially as set forth.

, 12. A machine for making leads and rules comprising a melting pot, means for ejectlng molten metal downward from the pot in a contlnuous stream, and a mold attached to the bottom of the pot to shape the metal so ejected, said mold having a vertical parsage in line with a port in the pot substantially as set forth.

13. A machine for making leads and rules comprising a Ineltingpot, means for ejecting molten metal from the pot in a continuous stream, a mold attached to the bottom'of the pot for shaping the metal so ejected, and means for cooling the mold, substantially as set forth. 1 c

14:. A machine for making leads and rules 'means for guiding the valve relatively to j therein, a plurality of cylinders leading to comprising a melting pot,'means for ejectnous stream, and a mold detachably secured to the pot below the level of the molten metal, ,sa1d mold having a straight passage ing molten metal from the pot 1n a continin line witha port in the bottom of the pot substantially as set forth.

. stream, a mold to shape the metal so ejected comprisingan apertured block lying fiat againstthe bottom oi the pot, a-pair of Ion,- gitudinal side members secured (lll'GClJlYiO said block, and a pair ofbloeks between said side members providing between them an elongated mold chamber open at the lower end, substantially asset forth.

17. A machine for making leads and, rules eoi'i'iprising. a'melting pot, means forej eeting mold to shape tliemetal so ej ected comp .ijng, an apertured' block lying; flat against the pot, a pair'ot longitudinal side members seeured to said blook, andfa pair of -blocks "between said sidev members prov ding between them an elongated mold chamber one u oi saidfjblocks being, adj .ustable toward and from the other, substantially as, set forth.

18. A maohinefor makingrleadsand rules comprisinga meltingpot, means-tor ejecb ing molten metal from the pot inacontin uous stream, a mold receivinggsuoh Install said mold comprising a block formingione side of a mold chamber, holes in theibloek adapted. to registerwithi holes in the *adjaw Lemm straight molding passage inlinewith said port. v p

20. A device for shaping fluid metalr eonr prisingi a melting pot, a closed chamber, a:

plurality of cylinders communicating at their-lower ends with said chamber; pistons in, thecylinders, means to force the pistons yieldlngly downward, means toprevent re-i turn of the metal, and a die connected to said cha mber.

21., A device for shaping fluid metal compri-singaan open melting pot having a, closed chamber, therein below thelevel of themetali in the ohamber, and a moldingpassage e tending in a right line from said ohan'iher to the atmosphere. a i r a v 22. Aimachine for making; printers leads and rules coi'i'iprising i a: melting pot, a; closed, chamber; below thenormal level of the moltenmetal, a, pluralityof cylinders extending through the'upperwvall' of the eliamber,,pistons in theehamhers, leyers pivotedi at one sideof the pot, and *means fora operating the levers in sequence, saidnneans being at' the side adjacent the pivots of the-"levers.

In: witness, whereof, I have hereunto set my handflat1'l/Vashington, District of Columbia, this 17th day o'ffMarch, A. Dynineteen hundred and twenty five.

GEORGE HIMQDAHL. f 

